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Related Experiment Videos

Saccades to moving targets.

T Eggert1, Y Guan, O Bayer

  • 1Department of Neurology, Ludwig-Maximilians University, Marchioninistr. 15, D-81377 Munich, Germany.

Annals of the New York Academy of Sciences
|April 14, 2005
PubMed
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Saccade amplitude and dynamics are influenced by target speed and retinal error. Eye movements differ for forward versus backward targets, even after accounting for smooth pursuit.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Systems Biology

Background:

  • Saccades are rapid eye movements crucial for visual exploration.
  • Understanding saccade generation involves dissecting contributions from target motion and retinal error.

Purpose of the Study:

  • To investigate how target speed and presaccadic retinal error influence saccade metrics and dynamics.
  • To differentiate the effects of target motion from smooth pursuit contributions.

Main Methods:

  • Monkeys (Macaca mulatta) performed saccades to stationary and moving targets.
  • Saccade velocity was corrected for intrasaccadic pursuit velocity.
  • Partial correlations analyzed the effects of retinal error and target speed on saccadic velocity profiles over time.

Related Experiment Videos

Main Results:

  • Saccade amplitude depends on both presaccadic retinal error and target speed during the latency period.
  • Saccade dynamics, after correcting for smooth pursuit, vary for forward and backward moving targets.
  • Presaccadic retinal error impacts eye velocity throughout the saccade, while target speed affects it only before peak velocity.

Conclusions:

  • Target speed and retinal error are key determinants of saccade amplitude and dynamics.
  • The cerebellum's role in local feedback loops is implicated in saccade generation control.